JP2943822B2 - Operating voltage control circuit for radio - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating voltage control circuit used in a small radio transceiver.

[0002]

2. Description of the Related Art In general, a circuit configuration of a radio receiver operating at a fixed voltage by a battery is devised so as to reduce current consumption. However, since it is necessary to maintain a certain receiving sensitivity, there is a limit to the amount by which current consumption can be reduced. There is also a system in which the power of the receiver is periodically turned on / off in a standby state, intermittent reception is performed, and a predetermined fixed voltage operation is switched from the time when an incoming call signal is received. If the time continues longer, no further reduction in current consumption can be expected.

[0003]

As described above, in the conventional radio, the current consumption at the time of reception does not become lower than the current value by the predetermined power supply voltage. Also, since the battery operation time is greatly affected by the presence or absence of a received signal and the talk time, there is a demand for maintaining the battery operation for a longer time, especially in a battery-driven portable small radio, but there is a limit. An object of the present invention is to provide an operating voltage control circuit for a radio device which can solve such a problem and further reduce current consumption.

[0004]

Operating voltage control circuit of radio of the present invention According to an aspect of the of the RSSI signal obtained from the receiving unit level
Digitally converted and output as received electric field data
The detection unit and the power supply voltage are controlled in multiple stages according to the voltage switching signal.
Power to be converted to one of the operating voltages and supplied to the receiver.
Pressure converter, and the operating voltage of the receiver is the maximum operating voltage.
The RSSI signal level is set in ascending order.
Received electric field from the detection unit at different levels
The data is stored in memory in advance as a plurality of reference values,
Received electric field data from the detection unit at the current operating voltage
And the reference value to determine whether the received electric field data is high or low.
Accordingly, the operating voltage is reduced stepwise using the plurality of reference values.
And a control unit for outputting a voltage switching signal for increasing / decreasing the voltage.
The control unit receives the reception electric field during the reception operation at the maximum operation voltage.
Data fell below the lowest value among the multiple reference values
When switching between the maximum operating voltage and the minimum operating voltage
Output a voltage switching signal, and receive
Operating voltage lower when field data exceeds higher reference value
Output a voltage switching signal to switch to the lower reference value
The voltage switch that switches the operating voltage to the higher one when
Characterized in that it is configured to output a replacement signal.
It is.

[0005]

FIG. 1 is a partial circuit block diagram of a radio apparatus according to an embodiment of the present invention. In the figure, 1 is an antenna, 2 is a receiving unit, and 3 is a transmitting unit. Reference numeral 4 denotes a received signal strength indication signal (RSSI signal: Receive Sign) corresponding to the received electric field strength.
al Strength Indicator signal). Reference numeral 5 denotes a control unit, and 6 denotes a voltage conversion unit.

[0006] The received wave input from the antenna 1 to the receiving unit 2 is detected and demodulated to output an audio signal,
An SI signal is output and provided to the detection unit 4. The received electric field data converted into a digital signal by the detection unit 4 is input to the control unit 5. The control unit 5 includes, for example, a CPU 51 and a memory 5.
The memory 52 (for example, E ² P-ROM) previously stores reference data corresponding to a plurality of levels of the received electric field data in order to change the operating voltage of the receiving unit 2. 4 is compared with the reference data, and a voltage switching signal is output to the voltage converter 6. The voltage converter 6 applies the voltage V obtained by converting the voltage B from the power supply circuit according to the voltage switching signal from the controller 5 to the receiver 2.

Next, the above-described voltage switching operation will be described in detail. FIG. 2 is a characteristic diagram for explaining the operation of the present invention, and shows the characteristic of the RSSI signal level with respect to the received electric field strength using the voltage V applied to the receiving unit 2 as a parameter. A to A in the figure
The data of the RSSI signal level at each point of F is written in advance in the memory 52 of the control unit 5 as reference data,
For example, the operating voltage V of the receiving unit 2 is used as comparison data in three stages of V1, V2, and V3. The relationship between the operating voltage values V1, V2, and V3 of the receiving unit 2 is V1>V2> V3. V1 is a voltage applied to the receiving unit 2 when Q1 in the figure is turned on. V2 is the voltage when Q1 is off and Q2 is on. At this time, since the current flows through R1 and R2, the current becomes a voltage lower than V1. V3 is the voltage when both Q1 and Q2 are off. Since the current flows only through R2, the voltage applied to the receiving unit 2 is lower than V2.

During operation of the radio, the control unit always compares the received electric field data from the detection unit 4 with the reference data in the memory 52. If the received electric field data to be compared is equal to or less than the value of the point A, the control unit Are alternately switched between V1 and V3, and the intermittent reception state is maintained. Received wave is input and detector 4
When the received electric field data from the terminal exceeds the value of the point A, the control unit 5
CPU 51 interrupts the intermittent reception and controls the voltage conversion unit 6 so that the operating voltage of the receiver 2 becomes the level of V1.
Further, when the received electric field data exceeds the value at point B, the applied voltage is controlled to V2, and when it exceeds the value at point C, the applied voltage is controlled to V3.

When the received electric field strength falls below the value at point F while the radio is operating at the voltage of V3, the operating voltage of the receiving unit 2 is switched to V2, and the value of the point D becomes higher during operation at V2. If it has decreased, it is switched to V1.

As described above, the operating voltage of the receiver is controlled to be raised or lowered in accordance with the magnitude of the received electric field strength, so that when the mobile station is close to the transmitting station and the electric field strength is large, the operating voltage of the receiving unit 2 is reduced. As a result, current consumption can be reduced. In the above description of the embodiment, the case where the current consumption of the receiving unit 2 is reduced has been described. However, it is needless to say that the current consumption of the transmitting unit 3 can be reduced by the same means when the wireless device is a transceiver. Nor. Further, the voltage switching step is not limited to three steps as in the embodiment, and may be set arbitrarily.

[0011]

As described in detail above, the following effects can be obtained by implementing the present invention. (1) Since the current consumption during transmission and reception can be reduced, the operation time by the battery becomes longer. (2) The current consumption in the reception state cannot be reduced by the conventional method of only the intermittent reception, but can be reduced regardless of the presence or absence of the reception signal. (3) RSS which was conventionally used only for displaying electric field strength
The control function of the present invention can be easily added by using the CPU provided in the wireless device using the I signal, so that the number of components can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a characteristic diagram illustrating the operation of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 antenna 2 reception unit 3 transmission unit 4 detection unit 5 control unit 6 voltage conversion unit 51 CPU 52 memory

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04B 1/16 H04B 1/18 H04B 1/40

Claims (2)

(57) [Claims] 1. The level of an RSSI signal obtained from a receiving unit.
Digitally converted and output as received electric field data
The detection unit and the power supply voltage are controlled in multiple stages according to the voltage switching signal.
Power to be converted to one of the operating voltages and supplied to the receiver.
Pressure converter, and the operating voltage of the receiver is the maximum operating voltage.
The RSSI signal level is set in ascending order.
Received electric field from the detection unit at different levels
The data is stored in memory in advance as a plurality of reference values,
Received electric field data from the detection unit at the current operating voltage
And the reference value to determine whether the received electric field data is high or low.
Accordingly, the operating voltage is reduced stepwise using the plurality of reference values.
And a controller for outputting a voltage switching signal for increasing / decreasing a voltage of the received electric field during the receiving operation at the maximum operating voltage.
Data fell below the lowest value among the multiple reference values
When switching between the maximum operating voltage and the minimum operating voltage
Output a voltage switching signal, and receive
Operating voltage lower when field data exceeds higher reference value
Output a voltage switching signal to switch to the lower reference value
The voltage switch that switches the operating voltage to the higher one when
Operating voltage control for radios configured to output
Your circuit. 2. The level of an RSSI signal obtained from a receiving unit.
Digitally converted and output as received electric field data
The detection unit operates the power supply voltage in three steps according to the voltage switching signal.
Operating voltages V1, V2, V3 (where V1>V2> V3)
Voltage converter for converting to any one and supplying it to the receiver
And when the operating voltage of the receiving unit is V1, the RSS
Three levels of levels set in ascending order of I signal level
The received electric field data from the detection unit at the time of the bell
It is stored in advance in memory as the second and third reference values,
Received electric field data from the detection unit at an operating voltage of
Comparing with the above reference value, corresponding to high / low of received electric field data
And the operating voltage is lowered stepwise using the three reference values.
/ And a control unit for outputting a voltage switching signal to increase, the control unit, during the reception operation in (b) the operating voltage V1, the reception field de
When the data is below the first reference value, the operating voltages are changed to V1 and V3.
Outputs a voltage switching signal to switch alternately, the reception electric field data
Switches the operating voltage to V2 when exceeds a second reference value
A voltage switching signal is output, and the received electric field data is set to a third reference value.
Voltage switching signal to switch the operating voltage to V3 when
And outputs, in reception operation in (b) the operating voltage V2, the reception field de
When the data falls below the second reference value, the operating voltage is set to V1.
A voltage switching signal for switching is output, and the received electric field data is
Voltage switching to switch the operating voltage to V3 when the reference value exceeds
Outputs switching signal, during reception operation at (c) the operating voltage V3, received field de
When the data falls below the third reference value, the operating voltage is set to V2.
Wireless configured to output a switching voltage switching signal
Machine operating voltage control circuit.